MAX9546 データシートの表示（PDF） - Maxim Integrated

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MAX9546

Differential Video Interface Chipset

Maxim Integrated 

MAX9546/MAX9547

Differential Video Interface Chipset

Applications Information

Differential Interface

The impedances of the differential interface are made

up of the two source resistors on the driver (MAX9546)

shown as RS and the load resistors on the receiver

(MAX9547) shown as RT in the Typical Application

Circuit. These resistors are chosen so their sum matches

the characteristic impedance (Z0) of the differential trans-

mission line. For example, a Category 5 cable has a char-

acteristic impedance of 110Ω, so the sum of the two RS

or RT resistors must be 110Ω to correctly drive the line.

To balance the signals they must be equal, so RS and RT

are 55Ω each.

Using Other Transmitters

and Receivers

The MAX9546/MAX9547 are used with other transmit-

ters and receivers; either other MAXIM devices or other

brands entirely. The overall performance of the MAX9546/

MAX9547 is dependent on the choice of the receiver or

transmitter, respectively.

Figure 2 illustrates one possible topology for the MAX9546

when using other devices with different offset require-

ments. Figures 3 and 4 illustrate two possible topologies

for the MAX9547 when using other devices with unknown

or different offset requirements. The circuit shown in

Figure 3 has a smaller PCB footprint at the expense

of requiring higher DC offset currents from the source

device. Figure 4 requires no DC offset currents although

it has a larger PCB footprint.

When using the MAX9546 with AC-coupling capacitors,

the FAULT signal will continue to function but only with

respect to a DC short condition. The LOS signal from the

MAX9547 is unaffected by coupling capacitors.

VDD

R1

3.92kΩ

4.7µF

D1

C4

R4

0.33µF

75Ω

0.1µF

+3.2 VDC OFFSET

18

3 FAULT

VCC VCC

OUT+ 7

R2

55Ω

U1

MAX9546

2 IN

OUT- 6

R3

GND GND

55Ω

4

5

C3

470µF

C5

470µF

0V OFFSET

+3.2 VDC OFFSET

TO A DEVICE

OTHER THAN A

MAX9547 USING

CAT5, ETC.

Figure 2. Suggested MAX9546 Configuration for Use with Other Devices

www.maximintegrated.com

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